Auto Light Function (With Twilight Lighting Function)
WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
Description
- BCM detects the combination switch condition with the combination switch reading function.
- BCM supplies voltage to the optical sensor when the ignition switch is turned ON or ACC.
- Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
- When ignition switch is turned ON, BCM detects outside brightness from the optical sensor signal and judges ON/OFF condition of the exterior lamp and each illumination, depending on the outside brightness condition (standard or twilight).
- BCM transmits each request signal to IPDM E/R via CAN communication, according to ON/OFF condition by the auto light function.
NOTE:
As to ON/OFF timing, the sensitivity depends on settings. The settings can be changed with CONSULT-III. Refer to
"HEADLAMP : CONSULT-III FUNCTION (BCM - HEAD LAMP) ".
Auto Lighting Timing Table
When the light switch is in AUTO position and the ignition switch is ON, the exterior lamps turns ON/OFF in the following condition.
EXTERIOR LAMPS CONDITION
| Exterior lamps | Standard Light ON (Sudden increase/decrease in brightness) | Twilight Light ON (Gradual increase/decrease in brightness) |
|---|---|---|
| ON | Outside brightness is 1250 lx or less for 3 seconds or more. | Filtered brightness is 3000 lx or less |
| OFF | Outside brightness is 2500 lx or more for 5 seconds or more. | Filtered brightness is 5000 lx or more |
Standard Light ON
BCM turns exterior lamps ON when outside brightness obtained from the optical sensor signal is 1250 lx or less for 3 seconds or more. And BCM turns exterior lamp OFF when outside brightness from the optical sensor signal is 2500 lx or more for 5 seconds or more.
Twilight Light ON (Twilight Lighting Function)
BCM detects twilight by filtered brightness.
- BCM filters outside brightness to block the impact of the rapid change in brightness, based on the optical sensor signal, and judges outside brightness.
- BCM detects changes in outside brightness, based on outside brightness obtained from the optical sensor signal and filtered brightness and judges ON/OFF of the exterior lamps.
- BCM starts filtering 0.3 seconds after the ignition switch is turned ON and the light switch is turned to AUTO.
- BCM filters signals from the optical sensor at intervals of 2 seconds. When the filtered brightness is higher than outside brightness (signal from the optical sensor), BCM decreases the filtered brightness by 20 lx*. When the filtered brightness is lower than outside brightness, BCM increases the filtered brightness by 20 lx*.
- BCM turns ON the exterior lamps when filtered brightness reaches 3000 lx and turns OFF when reaching 5000 lx.
*:When vehicle speed is 5 km/h or less, BCM decreases/increases the filtered brightness by 5 lx.